The 737 airplane is supported on six wheels and tubeless tyre assemblies, four on the main gear and two on the nose gear.The above sentence means "波音737由六个机轮和六个无内胎轮子进行支撑；其中，四个为前轮两个为主轮．"
A.1
正确答案是A
The 737 airplane is supported on six wheels and tubeless tyre assemblies, four on the main gear and two on the nose gear.The above sentence means "波音737由六个机轮和六个无内胎轮子进行支撑；其中，四个为前轮两个为主轮．"
A.1
正确答案是A